CN114393180A - Preparation method of 7021 aluminum alloy oversized ingot - Google Patents
Preparation method of 7021 aluminum alloy oversized ingot Download PDFInfo
- Publication number
- CN114393180A CN114393180A CN202111600504.3A CN202111600504A CN114393180A CN 114393180 A CN114393180 A CN 114393180A CN 202111600504 A CN202111600504 A CN 202111600504A CN 114393180 A CN114393180 A CN 114393180A
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- casting
- ingot
- aluminum alloy
- preparation
- crystallizer
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 51
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 5
- 239000004744 fabric Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D30/00—Cooling castings, not restricted to casting processes covered by a single main group
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a preparation method of a 7021 aluminum alloy oversized ingot, which comprises the following steps: casting the 7021 aluminum alloy melt, and cooling and forming to obtain an ingot; in the early stage of casting, 4 large-face corner water holes of the crystallizer are plugged; paving the bottom with pure aluminum with the thickness of more than 60 mm; in the casting process, the casting speed is 40-45 mm/min. The application provides a preparation method of a 7021 aluminum alloy oversized ingot, which reduces the cooling strength of the corner of the ingot by plugging water holes at the corner of a crystallizer before casting, and reduces aluminum leakage or waste cracking products caused by cold shut due to stable casting speed in the casting process.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to a preparation method of a 7021 aluminum alloy oversized ingot.
Background
With the rapid development of aerospace industry in recent years, the demand of high-quality aluminum alloy materials is continuously increased, and the demand of large-specification cast ingots is also increased. Because the alloy product has larger specification, the ingot casting forming is the main problem to be solved at present. Taking 510 × 2400mm oversized aluminum alloy cast ingot as an example, the width-thickness ratio is large, the cast ingot stress is larger, the cast ingot is difficult to form by adopting the traditional production process, and particularly, large-area cracks or bottom cracks appear at the beginning, so that the current specification-changing yield is low, and the supply-maintaining difficulty is caused.
Disclosure of Invention
The invention aims to provide a preparation method of an ultra-large size 7021 aluminum alloy ingot, which can solve the problem that the ultra-large size aluminum alloy ingot is difficult to form.
In view of this, the application provides a preparation method of a 7021 aluminum alloy oversized ingot, which comprises the following steps:
casting the 7021 aluminum alloy melt, and cooling and forming to obtain an ingot;
in the early stage of casting, 4 large-face corner water holes of the crystallizer are plugged; paving the bottom with pure aluminum with the thickness of more than 60 mm;
in the casting process, the casting speed is 40-45 mm/min.
Preferably, before the casting, when the base is adjusted, the distance between the middle of the small surface of the base and the upper edge of the crystallizer is controlled to be 120-140 mm.
Preferably, in the early stage of casting, pure aluminum is used for paving the bottom, the pure aluminum paving mode is adopted in the casting starting condition, the slagging operation is carried out when the thickness of the metal to be filled reaches 60mm in the crystallizer, the bottom paving speed is maintained at 30-40 mm/min, the launder flashboard is opened after the surface scum is completely paved, and the material is fed and cast.
Preferably, in the casting process, a quick cooling mode is adopted, and the water temperature of the quick cooling is 20-30 ℃.
Preferably, in the early stage of casting, the flow of a single cooling water is 50-60 m3/h。
Preferably, the ingot has a size of 510 x 2400 mm.
The application provides a preparation method of a 7021 aluminum alloy ingot with an oversized specification, which comprises the steps of casting 7021 aluminum alloy melt, cooling and forming to obtain an ingot; in the casting process, 4 large-surface corner water holes of the crystallizer are blocked in advance before casting, so that the cast ingot is prevented from cracking; the thickness of the pure aluminum bottom reaches more than 60mm, the speed is high during starting and casting, the casting speed does not climb, the casting speed (40-45) mm/min range reduces aluminum leakage or cracking waste products caused by cold shut.
Drawings
FIG. 1 is a photograph of a first improvement in a casting process according to an embodiment of the present invention;
FIG. 2 is a photograph of a second improvement in the casting process of an embodiment of the present invention;
FIG. 3 is a photograph of process parameters during casting according to an embodiment of the present invention;
FIG. 4 is a photograph of a finished ingot made in accordance with an embodiment of the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Aiming at the technical problems that 7021 aluminum alloy large-size 510X 2400mm ingots are easy to crack and difficult to form in the prior art, the invention combines a large-size special tool, is different from the traditional low-speed low-flow supply operation without bottom laying, and solves the problem of difficult ingot forming caused by the problem of large-area cracks at the bottom or the beginning. Specifically, the embodiment of the invention discloses a preparation method of a 7021 aluminum alloy oversized ingot, which comprises the following steps:
casting the 7021 aluminum alloy melt, and cooling and forming to obtain an ingot;
in the early stage of casting, 4 large-face corner water holes of the crystallizer are plugged; paving the bottom with pure aluminum with the thickness of more than 60 mm;
in the casting process, the casting speed is 40-45 mm/min.
In the above-mentioned preparation process, the 7021 aluminum alloy melt may be prepared according to a method well known to those skilled in the art, and the present application is not particularly limited. The casting process may be performed according to a method well known to those skilled in the art, except for the following differences, and the present application is not particularly limited.
In the casting process, the following adjustment is carried out to this application to solve the easy fracture of aluminum alloy ingot casting, the difficult problem of shaping specifically is:
(1) when the base is adjusted, the upper edge of the crystallizer at the middle distance of the small surface of the base is controlled to be 130mm, and the distance between the glass cloth bag and the base is controlled to be more than 25mm, so that the glass cloth bags are prevented from being adhered;
(2) 4 water holes of the corner of the large surface of the crystallizer are blocked before the start in order to prevent the ingot from cracking caused by too high cooling strength at the corner of the ingot and concentrated shrinkage stress;
(3) spreading bottom with pure aluminum, casting, performing slag beating operation when the thickness of the filled metal in the crystallizer reaches about 60mm, maintaining the bottom spreading speed at 37mm/min, opening a launder flashboard after surface scum is removed, and feeding and casting;
(4) fast cooling, cooling water flow is accurately matched by regulating and controlling cooling water temperature (20-26 ℃), and single cooling water flow is controlled to be 60m at the beginning3/h；
(5) The starting speed is high, in order to reduce waste products caused by aluminum leakage or cold shut, the starting speed does not climb, and the casting speed is maintained at (40-45) mm/min.
For further understanding of the present invention, the following examples are provided to illustrate the preparation method of the 7021 aluminum alloy oversized ingot, and the scope of the present invention is not limited by the following examples.
Examples
Taking a certain melting time of southwest aluminum production as an example, the melting time can produce 2 cast ingots with each specification of 510 x 2400 mm; casting the 7021 aluminum alloy melt, and cooling and forming to obtain an ingot; the other technical means are the same as the prior art except the following improvements in the casting process:
1) adjusting the distance between the glass cloth bag and the base to 25mm, and controlling the distance between the middle of the small surface of the base and the upper edge of the crystallizer to be 130mm, as shown in figure 1;
2) 4 water holes at the corner of the crystallizer are plugged, as shown in figure 2;
3) pouring pure aluminum into a crystallizer by using a pure aluminum barrel at the beginning for bottom paving, wherein the bottom paving thickness is 60mm, and the bottom paving speed is 37 mm/min;
4) after the bottom paving is finished, casting at a casting speed of 40mm/min, wherein the specific process parameters of the melting time are shown in the following figure 3;
5) the parameters and the molding conditions of the heat treatment are shown in Table 1;
TABLE 1 data sheet of relevant parameters in casting process
Molding condition: the molten ingot has good surface quality and no defect; the number of 6 ingots of the specification in the batch is 12, the number of the ingots is 1, the forming rate reaches 91%, and the forming rate is shown in figure 4.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A preparation method of a 7021 aluminum alloy oversized ingot comprises the following steps:
casting the 7021 aluminum alloy melt, and cooling and forming to obtain an ingot;
in the early stage of casting, 4 large-face corner water holes of the crystallizer are plugged; paving the bottom with pure aluminum with the thickness of more than 60 mm;
in the casting process, the casting speed is 40-45 mm/min.
2. The method according to claim 1, wherein the distance between the middle of the facet of the base and the upper edge of the mold is controlled to be 120 to 140mm when the base is adjusted before the casting.
3. The preparation method according to claim 1, characterized in that pure aluminum is used for bottom paving in the early stage of casting, pure aluminum is paved in the casting starting condition, the slagging operation is carried out when the thickness of the metal to be filled in the crystallizer reaches 60mm, the bottom paving speed is maintained at 30-40 mm/min, a launder flashboard is opened after surface scum is cleaned, and feeding and casting are carried out.
4. The preparation method according to claim 1, characterized in that the casting process is carried out by adopting a rapid cooling mode, and the temperature of the rapid cooling water is 20-30 ℃.
5. The method according to claim 1, wherein the flow rate of the single cooling water is 50-60 m in the early stage of casting3/h。
6. A method according to any one of claims 1 to 5, wherein the ingot has a size of 510 x 2400 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111600504.3A CN114393180B (en) | 2021-12-24 | 2021-12-24 | Preparation method of 7021 aluminum alloy oversized ingot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111600504.3A CN114393180B (en) | 2021-12-24 | 2021-12-24 | Preparation method of 7021 aluminum alloy oversized ingot |
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|---|---|
| CN114393180A true CN114393180A (en) | 2022-04-26 |
| CN114393180B CN114393180B (en) | 2024-05-10 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006104537A (en) * | 2004-10-06 | 2006-04-20 | Nissin Kogyo Co Ltd | Method for casting aluminum alloy |
| CN201380275Y (en) * | 2009-03-17 | 2010-01-13 | 上海梅山钢铁股份有限公司 | Plate blank continuous casting crystallizer |
| CN104439191A (en) * | 2014-12-12 | 2015-03-25 | 西南铝业（集团）有限责任公司 | Production method of 6-sereis alloy ingots |
| CN104532043A (en) * | 2014-12-12 | 2015-04-22 | 西南铝业（集团）有限责任公司 | Preparation method of 7 series aluminum alloy ingots |
| CN105018808A (en) * | 2015-08-13 | 2015-11-04 | 东北轻合金有限责任公司 | Method for manufacturing large-size heat-treatment aluminum alloy slab ingot capable of being strengthened |
| CN112935205A (en) * | 2021-03-24 | 2021-06-11 | 西北铝业有限责任公司 | 7xxx series aluminum alloy large-size hollow ingot production device and process thereof |
-
2021
- 2021-12-24 CN CN202111600504.3A patent/CN114393180B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006104537A (en) * | 2004-10-06 | 2006-04-20 | Nissin Kogyo Co Ltd | Method for casting aluminum alloy |
| CN201380275Y (en) * | 2009-03-17 | 2010-01-13 | 上海梅山钢铁股份有限公司 | Plate blank continuous casting crystallizer |
| CN104439191A (en) * | 2014-12-12 | 2015-03-25 | 西南铝业（集团）有限责任公司 | Production method of 6-sereis alloy ingots |
| CN104532043A (en) * | 2014-12-12 | 2015-04-22 | 西南铝业（集团）有限责任公司 | Preparation method of 7 series aluminum alloy ingots |
| CN105018808A (en) * | 2015-08-13 | 2015-11-04 | 东北轻合金有限责任公司 | Method for manufacturing large-size heat-treatment aluminum alloy slab ingot capable of being strengthened |
| CN112935205A (en) * | 2021-03-24 | 2021-06-11 | 西北铝业有限责任公司 | 7xxx series aluminum alloy large-size hollow ingot production device and process thereof |
Non-Patent Citations (2)
| Title |
|---|
| 陈仁桂;何宇棋;黄景霖;: "不同尺寸大规格铝合金扁锭同时铸造的工艺研究", 轻合金加工技术, no. 10, 20 October 2017 (2017-10-20), pages 21 - 25 * |
| 陈仁桂;杨浩;蓝东华;黄金宁;朱玉涛;: "7075铝合金2540mm×550mm规格扁锭铸造工艺研究", 轻合金加工技术, no. 01, 20 January 2020 (2020-01-20), pages 18 - 21 * |
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